<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .c1{
            border: 1px solid red;
            width: 200px;
            height: 200px;
        }
    </style>
</head>
<body>

<div class="c1" id="d1">
    <span>你好span</span>
</div>

<a href="http://www.baidu.com">百度</a>

<script src="jquery.js"></script>
</body>
</html>